Fastening device



FIG. 1 is a top, front, left-side perspective view of a fastening device;

FIG. 2 is a bottom, front, right-side perspective view thereof;

FIG. 3 is a front perspective view thereof;

FIG. 4 is a right side perspective view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

CLAIM The ornamental design for a fastening device, as shown and described. 